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ACCOUNTING FOR CERTAIN LOANS ACQUIRED IN A TRANSFER - Carrying amount of loans included in balance sheet of loans receivable (Details) (Loans Receivable, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Carrying balance of acquired credit-impaired loans $ 1,867us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet $ 1,873us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
Construction/Land
   
Business Acquisition [Line Items]    
Carrying balance of acquired credit-impaired loans 408us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConstructionAndLandMember
411us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConstructionAndLandMember
One-to-four family residential
   
Business Acquisition [Line Items]    
Carrying balance of acquired credit-impaired loans 1,038us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
1,035us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
Multi-family residential
   
Business Acquisition [Line Items]    
Carrying balance of acquired credit-impaired loans      
Commercial
   
Business Acquisition [Line Items]    
Carrying balance of acquired credit-impaired loans 13us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
14us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Dupont State Bank    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans 2,651us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
2,703us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
Fair value adjustment for credit-impaired loans (784)us-gaap_CertainLoansAndDebtSecuritiesAcquiredInTransferAllowanceForCreditLossesDueToSubsequentImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
(830)us-gaap_CertainLoansAndDebtSecuritiesAcquiredInTransferAllowanceForCreditLossesDueToSubsequentImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
Carrying balance of acquired credit-impaired loans 1,867us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
1,873us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
Dupont State Bank | Construction/Land    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans 650us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConstructionAndLandMember
682us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConstructionAndLandMember
Dupont State Bank | One-to-four family residential    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans 1,389us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
1,400us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_OneToFourFamilyResidentialRealEstateMember
Dupont State Bank | Multi-family residential    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans      
Dupont State Bank | Nonresidential real estate and agricultural land    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans 562us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_NonresidentialRealEstateAndAgriculturalLandPortfolioSegmentMember
568us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_NonresidentialRealEstateAndAgriculturalLandPortfolioSegmentMember
Dupont State Bank | Commercial    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans 24us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
24us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Dupont State Bank | Consumer and other    
Business Acquisition [Line Items]    
Outstanding balance of acquired credit-impaired loans $ 26us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConsumerAndOtherPortfolioSegmentMember
$ 29us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_BusinessAcquisitionAxis
= rivr_DupontStateBankMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rivr_ConsumerAndOtherPortfolioSegmentMember